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The neighbor who tried to help a Tequesta couple who were killed in Monday's face-biting attack has been released from the hospital.

Jeff Fisher was released from the hospital Thursday and is home with family, Martin County Sheriff's Office officials said.

Fisher, 47, tried to help but was stabbed multiple times during the attack on Michelle Mishcon, 53, and husband John Stevens III, 59. Austin Harrouff, a 19-year-old Florida State University student, is accused of stabbing and beating Mishcon and Stevens.

Authorities say when deputies arrived at the couple's home, they found the teen biting parts of Stevens' face. It took a stun gun, a K-9 dog and multiple deputies to subdue Harrouff, officials said.

Harrouff remains hospitalized in stable condition and is sedated with a breathing tube, officials said Thursday. Officials said hospital blood tests showed no signs of methamphetamine, cocaine, heroin or other common drugs in Harrouff. It will take longer to test for less common hallucinogenic drugs such as flakka or bath salts.

Officials said Thursday that blood tests have been sent to the FBI for more in-depth testing. Harrouff hasn't been formally charged with any crimes but detectives are working with the State Attorney's Office to determine charges, officials said.

Funeral services for the victims will be held Friday in Fort Lauderdale.